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Research Collection Doctoral Thesis Molecular mechanisms controlling lymphatic vascular function Author(s): Shin, Jae (Jay) Woo Publication Date: 2008 Permanent Link: https://doi.org/10.3929/ethz-a-005708685 Rights / License: In Copyright - Non-Commercial Use Permitted This page was generated automatically upon download from the ETH Zurich Research Collection. For more information please consult the Terms of use. ETH Library DISS. ETH NO. 17752 MOLECULAR MECHANISMS CONTROLLING LYMPHATIC VASCULAR FUNCTION A dissertation submitted to ETH Zurich for the degree of Doctor of Sciences presented by JAE (JAY) WOO SHIN April 4th, 1981 citizen of United States of America accepted on the recommendation of Prof. Michael Detmar Prof. Dario Neri 2008 TABLE OF CONTENTS 1 SUMMARY........................................................................................................6 1.1 Summary ..............................................................................................................................................7 1.2 Zusammenfassung...............................................................................................................................9 2 INTRODUCTION............................................................................................12 2.1 CHARACTERISTICS OF THE LYMPHATIC VASCULATURE.........................................13 2.1.1 Anatomy and physiology of the lymphatic vasculature......................................................13 2.1.2 Genes and mechanisms in lymphatic development .............................................................15 2.1.2.1 Endothelial lineage-specific differentiation ......................................................................16 2.1.2.2 Major molecular markers of lymphatic endothelium .......................................................22 2.1.2.3 Key lymphangiogenic growth factors ...............................................................................25 2.1.3 Pathologies of the lymphatic vasculature..............................................................................30 2.1.3.1 Lymphatic Dysfunction, Lymphedema.............................................................................30 2.1.3.2 Lymphatic vessels in inflammation and the immune response .......................................31 2.1.3.3 Lymphatic involvement in tumor metastasis ....................................................................32 2.2 MICROARRAY TECHNOLOGY.................................................................................................35 2.2.1 Oligonucleotide microarray technology ................................................................................35 2.2.2 Gene expression data analysis.................................................................................................36 3 RESULTS AND DISCUSSION .......................................................................38 3.1 Prox1 promotes lineage-specific expression of FGF receptor-3 in lymphatic endothelium..39 3.1.1 Introduction ...............................................................................................................................39 3.1.2 Results.........................................................................................................................................40 3.1.2.1 Ectopic expression of Prox1 in primary BEC upregulates FGFR-3................................40 3.1.2.2 Prox1 binds to the FGFR-3 promoter and activates its transcription ..............................43 3.1.2.3 Identification of the putative Prox1 binding sites in the FGFR-3 promoter ...................45 3.1.2.4 Expression of FGFR-3 in developing lymphatic vessels of mouse embryo and of human skin...........................................................................................................................................46 3.1.2.5 Signaling through FGFR-3 promotes LEC proliferation .................................................47 3.1.2.6 FGF-2 binds directly to low and high affinity receptors in LECs and subsequently internalized for degradation................................................................................................................48 3.1.2.7 FGF signaling regulates migration, proliferation and apoptosis of cultured primary lymphatic endothelial cells .................................................................................................................50 3.1.3 Discussion...................................................................................................................................52 3.2 Quantification of vascular lineage-specific differentiation and molecular characterization of in vivo (lymph)angiogenesis by a novel low-density microvascular differentiation array ..............56 3.2.1 Introduction ...............................................................................................................................56 3.2.2 Results.........................................................................................................................................57 3.2.2.1 Comprehensive identification of vascular lineage-specific gene signatures ..................57 3.2.2.2 Identification of lineage-specific biological functions by in silico analysis...................60 3.2.2.3 Using the LD-MDA to quantify lineage-specific endothelial cell differentiation..........63 3.2.2.4 Hierarchical clustering according to endothelial lineage-specific gene signatures........65 3.2.2.5 Identification of (lymph)angiogenic-mediators using a novel Prediction Relevance Ranking analysis .................................................................................................................................66 3.2.3 Discussion...................................................................................................................................68 3.3 Lymphatic-specific expression of dipeptidyl peptidase IV and its dual role in lymphatic endothelial function.....................................................................................................................................72 3 3.3.1 Introduction ...............................................................................................................................72 3.3.2 Results.........................................................................................................................................73 3.3.2.1 Enhanced expression of DPPIV/CD26 by LEC as compared to BEC............................73 3.3.2.2 Lymphatic vessels in normal skin specifically express DPPIV.......................................74 3.3.2.3 DPPIV is expressed by lymphatic vessels in several human organs...............................76 3.3.2.4 Diprotin A inhibits the enzymatic activity of DPPIV but does not induce LEC proliferation and migration.................................................................................................................78 3.3.2.5 SiRNA-mediated knockdown of DPPIV inhibits LEC adhesion, migration and tube- formation 79 3.3.3 Discussion...................................................................................................................................80 3.4 Transcriptional profiling of VEGF-A and VEGF-C target genes in lymphatic endothelium reveals endocan as a novel mediator of lymphangiogenesis.................................................................83 3.4.1 Introduction ...............................................................................................................................83 3.4.2 Results.........................................................................................................................................85 3.4.2.1 Microarray analysis reveals novel mediators of VEGF-A and VEGF-C-induced effects on lymphatic endothelial cells............................................................................................................85 3.4.2.2 ESM-1 expression is potently induced in LEC by VEGF-A and VEGF-C ....................89 3.4.2.3 ESM-1 promotes LEC proliferation and migration induced by VEGF-A and VEGF-C 92 3.4.2.4 ESM-1 promotes lymphatic vessel activation by VEGF-A in vivo ................................95 3.4.3 Discussion...................................................................................................................................96 4 CONCLUSIONS AND OUTLOOK ..............................................................100 4.1 Conclusions ..................................................................................................................................... 101 4.2 Outlook ............................................................................................................................................ 103 5 MATERIALS AND METHODS ...................................................................105 5.1 In Vitro ............................................................................................................................................. 106 5.1.1 Cell culture.............................................................................................................................. 106 5.1.1.1 Isolation of human dermal BEC and LEC ..................................................................... 106 5.1.1.2 Cells.................................................................................................................................. 106 5.2 Target validations .........................................................................................................................